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12/03 DR4300 Circular Chart Recorder Product Manual
23
Taking electrical noise precautions
Electrical noise is composed of unabated electrical signals which produce undesirable effects in
measurement and control circuits.
Digital equipment is especially sensitive to the effects of electrical noise. Your recorder has built-in circuits
to reduce the effect of electrical noise from various sources. If there is a need to further reduce these
effects:
• Separate External Wiring—Separate connecting wires into bundles (see Table 2-6) and route the
individual bundles through separate conduits or metal trays.
• Use Suppression Devices—For additional noise protection, you may want to add suppression
devices at the external source. Appropriate suppression devices are commercially available.
For additional noise information, refer to document 51-52-05-01, How to Apply Digital Instrumentation in
Severe Electrical Noise Environments.
CE conformity special conditions (Europe)
Shielded cables with a drain wire are required for all input and output cables. All instrument shielded
cable drain wires must be connected to a low impedance earth ground at the entry fitting. Cable/conduit
entry fittings shall effectively terminate the cable shield connecting the shield to the enclosure conductive
coating. The shielded cable shield shall not extend into the instrument closure.